| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | eyepiece | astronomy | A crucial component of a telescope or microscope for observing distant or tiny objects | 1 |
| 2 | eyepiece | astronomy | An essential component of a telescope for observing celestial objects | 1 |
| 3 | eyepiece | astronomy | Essential component for observing celestial objects in astronomy or for magnifying specimens in microscopy | 1 |
| 4 | eyepiece | telescopes | An essential component of a telescope for observing celestial objects | 1 |